Pacific coast type trimmer with tightener take up



. 1 v 1,620101 March 927 c. A, HUFFMAN I PACIFIC COAST TYPE TRIMMER WITH TIGHTENER TAKE-UP Filed July 15 1925 2 Sheets-Sheet 1 five/716;; C/mzies/l. lfwf W iueas 1,620,101 I March 8, 1927- HUFFMAN PACIFIC COAST TYPE TRIMMER WITH TIGHTENER TAKE-UP I Filed July 15 1925 2 Sheet-Sheefi 2 INVENTOR. C imrl @A fluff/r1 ma.

QYWM ATTORNEW Patented Mar. 8, 1927. UNITED STATES PATENT OFFICE.

CHARLES A. HIT'FFMAN, or oirevmw, wisaiaeioa, ASSIGN'OR T was LONG B'ELL LUMBER COMPANY, or LONGVIEW, wasnaneron, A ooRPo'nAT-Ioiiv OF Misso'UR'I.

rAoIF-Io cease TYPE TRIMMER warn r-rerrrniina TAKE UP.

Application filed my 13, 1925. Serial No. 43,242.

around which the shaft ladder swings when movedupw'ardly by its connections 13. In order to automatically maintain a tight bearingito compensate for wear, a pair of circular follower plates 14 are slidingly received on the shaft 11- and are in abutment with the projecting ends of the conical bearings 12. One of said plates 14 is rigidly secured to the ends of a pair of oppositely disposed bolts 15, the opposite ends thereof being slidingly-received with a pair of openings 16 in the other follower plate 14. Encircling the bolts are a pair of expansion springs '17 which by exerting pressure in opposite direc- This invention relates to lumber trimmers and has for its object to produce means for automatically compensating-for the wear in the saw-ladder trun'nio-ns. In lumber trimmers the saws are constantly revolving at high speed regardless of whether the particular saw is inits operative or inoperative position and it is of importance to provide a steady and tight bearing to avoid wobbling or uneven running of the saw.

With the object named in view the invention consists in certain novel and useful features of construction and organization of parts as hereinafter described and claimed;

d i Order th t, it may b f ll undeptions against the loose follower plate 14- and stood, reference is to be had to the accomagmnst 11 P 1 f ension adJuSting nuts 18 panying drawings, in which 011 the bolts, automatically force the half Figure 1 is an end elevation of one saw 001168 llllt0 h bearings 3 and thereby comf a trimmer in Operative i i pcnsate for the wear of the bearings. It

will be apparent that as the pressure on the inclined face of the cones is transmitted to the parallel surfaces of the center shaft 3, the saw-ladder will swing around the cone bearings and not around the center shaft.

In Figures 4 and 5, a modified form of takeup is illustrated in which a bracket 19 is secured to the trimmer frame 8 and is formed with one-half of a bearing. Pivoted at 20 to the said bracket 19 is the other part of the bearing 21 (slightly less than half). Formed on the bearing part 21 is an up standing ear 22 having a vertical upwardlyopening slot 28. Secured to the bracket 19 and passing through the slot 23 is a bolt 24 provided With an adjusting nut 25 at its end. Fitted between the nut 25 and the outer face of the car 22 is an expansion with suitable bearin 's 3 within which is sprmg 26 i by Constantlytendmg O journaled a saw-shaft 4 carrying at one of j h i Plvot 2O W111 HS ends a .9 f 1 In the general application of saw-ladders The Opposite Grids of l 1 exemplified by Figure 1, the saw shaft 4 formed with opposltely'fitcmg (pntcal t" carries midway between the parallel arms ings 6 and are snugly received within a pair 1 a Pulley Wheel 27 encircled by a drive of brackets 7 securely fastened to the front a 28 which passeslearwardly around a P of the framework 8 of the hummer suitable idler pulley 29 and over a constanthlaced y cl'oss'hmhe The ends of the ly driven pulley 30 secured to the back hlackhhs 9 engaged y the l of uholts member 31 of the trimmer frame. As each 10 Whlch lightly Chuhl) P agalnsh the under" trimmer saw is vertically adjusted through side of the brackets a short trunnion shaft or it Connections 13 i Operative or inoperative rod position according to the lengths of lumber shdlhgly fitted 0h pp sldes 0f the to be cut, means must be provided to autorods 11 and received within each of the bearmatically tension the driving belt, and in ings 3 are two pairs of conical trunnions order to maintain the proper tension on the comprising oppositely-facing half cones 12, belt regardless of the position of the saw Figure 2 is a plan view of the mechanism as shown in Figure 1.

Figure 8 is an enlarged plan View of a saw-ladder with the saw shaft and drive belt 0 omitted and with the ladder trunnion in section.

Figure 4 is a section on the line IV-IV of Figure 3.

Figure 5 is an end elevation of a modified 30 form of take-up bearing.

Figure 6 1s a face view of the bearing shown in Figure 5.

In the said drawings, where like reference characters identify corresponding parts in all of the figures, the saw-ladder frame comprises a pair of spaced parallel arms 1 integrally formed with connecting arms or braces 2. The arms 1 at one end are formed in its travel around the cone bearings 12, a support .32 is pivotally mounted at 33 on the frame work 8 and carries at its lower end an idler or tension pulley 34 in contact with the belt 28. A uniform tension on the belt is maintained by the pulley 34 through the gravitative action of an adjustable wei ht 35 carried at the end of a laterally proi ecting arm 36 secured to the support 31. The lumber L to be cut into lengths is fed to the saw by means of an endless travelling chain 37. carried by a suitable table or support 38.

From the above description it will be aparent that while I have described and ilustrated the preferred forms of the invention, I reserve the right to make all changes properly falling within the spirit and scope of the appended claims.

I claim: I Y

1. A saw ladder having opposed conical bearing-receiving openings at one end, a pair of conical bearings received in said openings, a suitably-supported rod extendingaxially through said conical bearings for guiding the same, and expansion means on said rod for applying continuous opposite endwise pressure on the bearings to force them in the bearing openings without effecting longitudinal movement of the rod.

2. A saw ladder having opposed conical bearing-receiving openings at one end, a suitably-supported guide rod extending through said openings, a pair of slit conical bearings at each end of said rod within said bearing openings, a follower 011 said rod in contact with one pair of said conical bearings, a pair of bolts carried by said follower,

a second follower in contact with the other pair of bearings and having sliding engagement with said bolts, and expansion springs exerting pressure in opposite directions on said followers to force the conical bearings into position.

In witness whereof I hereunto affix my signature.

CHARLES A. HUFFMAN. 

